US Midwest braces for dangerous arctic chill

Millions of Americans braced Tuesday for a dangerous polar vortex which began to settle over a broad swath of the United States, threatening to set new records for cold as schools and businesses closed and authorities warned of frostbite. Temperatures in almost a dozen states stretching over 1,200 miles from the Dakotas to Ohio were forecast to be the coldest in a generation, if not on record. The National Weather Service (NWS) forecast temperatures between -10 to -40 degrees Fahrenheit (-23 to -40 Celsius) by Wednesday, with wind chill making it seem as cold as -65 degrees Fahrenheit in one area of Minnesota.